Hydraulic-motor-controlling mechanism.



E. L. DUNN.

HYDRAULIC MOTOR CONTROLHNG MECHANISM.

APPLICATION HLED OCT. 12, I915.

L%Q,9fi& Patented 001; 16, 1917.

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HYDRAULIC MOTOR CONTROLLING MECHANISM.

APPLICATION FILED OCT. I2. 1915.

1,242,928 Patented (m. 16, 1917.

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E. L. DUNN.

HYDRAULIC MOTOR CONTROLLING MECHANISM.

APPLICATION FILED OCT. 12. 1915.

Patented Oct. 16, 1917.

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E. L. DUNN.

HYDRAULIC MOTOR CONTROLUNG MECHANISM,

APPLICATION FILED OCT. 12, 1915.

Patentefl Oct. 16, 1917.

4 SHEETS-SHEET 4.

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s res rrr union EDWARD LEE DUNN, OE WORCESTER, MASSACT-IUE'JETTS, ASSIGNUR TO STANDARD PLUNGER ELEVATOR COIWPANY, OF WGRCESTER, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS,

HYDRAULICMOTOB- CONTROLLING MEGHAN ISM.

citizen of the United States, residing at \Vorcester, in the county of Worcester and State of Massachusetts, have invented ,ccr-

tain new and useful Improvements in Hydraulic Motor Controlling Mechanism, of

which the following is a full, clear, and exact specification.

This invention relates to hydraulic motors,

and has particular reference to a controlling mechanism whereby the speed of a hy- Qdraulicmotor may lee-automatically main- '7 tained at a predeterminedrate irrespective of the load.

The invention is shown herein applied to a hydraulic elevator of the direct plunger type, and adapted. for maintaining the speed of either ascent or descent of the elevator constant, whether lightly or heavily loaded.

As shown herein, there is combined with a well known three way valve mechan sm,

,an auxiliary valve mechanism which is so controlled by the flow of the water to or from the main motor as to cause the main .controlling valve to assume an open position such as to produce a predetermined speed of the motor at varying loads.-

The invention is conveniently applied to power operated hydraulic valves controlled by a pilot valve, and a characteristic feature of the invention is that the automatic devices which control the extent of opening of the main valve operate independently of the pilot valve according to the velocity of the water flowing to or from the motor.

In prior hydraulic valves such as are controlled by a pilot valve, when themotor is running, the opening of the valve is always proportional to the position of the operators controlling lever. Thus if the operator motor cylinder, an automatic valve, or valves which are controlled by the flow or velocity of water to or from the main cylinder. These automatic valves really exercise the definitive control of the opening of the main valve, and limit the. opening of the main valve so that a predetermined speed cannot Specification of Letters Patent.

Patented Oct. 16, 1917.

Application filed Qctober 12, 1915. Serial No. 55,387.

be exceeded, even though the operator on the car may have thrown the car lever to such an extent as to produce an excessive speed in either direction. If the velocity of water determined speed by his car lever, but cannot exceed such speed either with a light ascending load or with a heavy, descending load, which are the conditions under which excessive speeds in plunger elevators are produced.

In the specific form of the invention illus trated herein, there is interposed in the to and from pipe, a vane which oscillates a shaft connected to the auxiliary automatic speed controlling valves, there being one valve controlled by oscillation of the vane in one direction, as when the elevator is ascending, and another valve controlled by oscillation of the vane in the opposite direction as when the elevator is descending. These valves are between the pilot valve and the main valvemotor cylinder, so that they operate to cut down the amount of water which is applied to move the main valve, and thus stop it when it has opened suiii ciently to produce the desired speed. It will thus be seen that the opening of the main valve will vary withthe load and speed, but cannot open to such an extent as to produce excess speed. There are numerous advantages for such an arrangement, aside from the assurance of safety against excessive speeds, the principal additional advantage being that there will be a saving in water used to operate the main valve, and also I there will not be such excessive fluctuations of pressure in the pressure side of the system, allowing the pumps to operate under a more even load.

In the accompanying drawings, Figure 1,

is a view of valve mechanism embodying the herein largely in outlineior the sake of clearness.

1 represents the main valve cylinder having the supply pipe 2, and the exhaust pipe 3 connected respectively with pipes 4, 5', leading through automatic valves 6, 7, to

the to and fr impipe 8, the latter pipe being connected to themain cylinder 93 and the cylinder containing the usual plunger '10, and

platform 11- 1-2 representsthe pilot valve casing containing the reciprocating pilot "valve stem 13, which is controlledby. lever 14 and cable 15, the cable-being controlled by a'hand lever on the car 1n the usual; man

, ner, as shown in the above patent, but not necessary to be illustrated herein.

The" pilot valve casing is connected by a pipe 17 to one end'of' the main valve, so as to apply pressure to the piston 18, or permit water to exhaust from theright side of piston 18. 19 is a cooperating piston on the main valve stem having a packing which The slides on the stationary sleeve 20. motion ofthe valve stem in one or the other dlrection 15 produced by the differential action of this piston 19 and the, end. piston manner.

operator ordinarily determines the extent of openingof the main valve by the position,

18, as is well understood. The main valve also has a rack QQ'Which engages with a pinion on the pilot valve stem and a worm mechanism so that When'the main valve opens the pilot valve is closed in the usual It is by this mechanism that the of his car lever. VVhen the piston 19 moves to the left in Fig. 1, it opens the main valve port 23, so that the pressure water can flow from pipe 2 into pipe 4 and thence through automatic valve 6 to pipe 8 and to the motor cylinder 9, to raise the car. When the car is to descend, the main valve moves to the right in Fig. 1 until piston 24 uncovers port 25 so that the water can exhaust from cylinder 9 through pipe 8, down automatic valve 7, pipe 5, port 25 and pipe 3. hen the main valve is to be moved to the left, the pilot valve is thrown so as to connect the right-hand end of the main valve cylinder 1 by pipe 17 to pressure. This is from pipe 17, through pilot valve 12 to 1 pipe" 32,

v through automatic speed valve portBQl, to

pipe 30 and main pressure supply 2. When the main valve is to be moved to the right by pressure on piston 19, the pilot valve will" be thrown so as to connect the right side of motor piston 18 to exhaust through pipe 17', pilot valve to pipe 27, through automatic speedvalve 28 to pipe 29 and main exhaust 3. In each caseit will be seen that the automatic speed control valves 28, 31, when closed, will stop the movement of the main valve, even though the pilot valve remains open. 35 represents a vane pivoted on a shaft 36 journaled in pipe 8 and suitably packed. 37, 37 are stops to limit the oscillstion of the vane. .It will be seen that if the flow is in one direction, the vane will move inthat direction, and vice versa,-thereby rocking the shaft 36. V i

In Figs. 4' and 5, the shaft 36 is provided with arms 38, each of which is connected by a link 39 to valve stems 40, 41. These valve stems pass through packings '42, '42 at opposite ends and also through a bushing 43 connecting the pipes 32, 30 and 29, 2?. The" bushings 43 are provided with graduated holes 44, constituting a graduated port, and these ports are controlled by a piston 45 on the valve stem41. The valves 45 are unbalanced so that the pressure ofthe water tends tohold them in open position as shown in Fig. 5, independently of the springs 46. As seen in Fig. 5, the springs 46' are attached'at one end to arms 47, carried by the respective valve stems 40, 41, and at the other end pass through lugs 48 carriedby the valve casings. The springs are attached to bolts'49 and are adjusted as to tension by nuts 50, so that by adjusting the tension of springs46, the up and down speedso1- thecar at which the valves 40 or 41 are actuated, are separatelyvaried. When the car slows up and the valves 28, 31, open, it will be seen that the water pressure will accelerate them, so that interference with the normal pilot valve control will not occ'ur.

This is an important'feature of this inven-' tion, since it is desirable that the speed regulator be inoperative until the predetermined speed is reached, but it must then operate quickly soasto instantly stop fun ther opening of the main valve, and. must notprevent speeding up of the main valve when required;

From the foregoing description, it will: be seen that-this invention automatically governs orlimits the stroke of the main valve independently of the operator, the main valve being governed by the speed of the water, independently of the position of the car lever. It is therefore possible with this invention to maintain uniform car speed with var iable'loads, and with the main valve either wide open or partially so.

While a preferred form oi the invention has been illustrated herein, applied to a plunger elevator of well known type, it is to beunderstood that the invention is not limited'to such application, but is applicable to any hydraulic valve mechanism wherein shown herein can also be modified Without departing fromthe scope of the invention, Y

1. The combination with a main valve, of

flow controlled means for governing the travel of said valve. 2

2. The combination with a main valve, a pilot valve, and a movable element controlled by the main valve, of meansdependent upon the speed of said movable element limiting the movement of the main valve independently of the pilot valve.

3. The combination with a main valve controlling a fluid, a movable element controlled thereby, and means aifected by said fluid for controlling the movement of said valve.

4. The combination with a main valve and a pilot valve connected to be closed by movement of the main valve, of independent means for stopping the main valve at an intermediate point in its stroke.

The combination with a main valve and a pilot valve connected to be closed by movement of the main valve, of flow controlled means for stopping the main valve at an intermediate point in its stroke.

6. The combination with a main valve and a pilot valve connected to be closed by movemeut of the -main valve, of independent valve means for controlling the movement I of the main valve.

7. The combination with a main valve and a pilot valve connected to be closed by movement of the main valve, of independent automatic valve means for controlling the movement of the main valve.

8. The combination with a main valve and a pilot valve connected to be closed by movement of the main valve, of independent flow actuated valve means for controlling the movement of the main valve.

9. The combination with a main valve, operating means therefor, and a movable element controlled by said valve of independent means dependent upon the speed of said movable element for limiting the movement of the main valve.

10. The combination with a main valve, and operating means therefor, of flow actuated means for limiting the movement of the main valve.

11. The combination with a main valve, and operating means therefor, of flow actuated valve means for limiting the movement of the main valve.

12. The combination with a main valve,

and operating means therefor, of a pipe con nected with said valve, means 1n said pipe responsive to flow, and means connected thereto for limiting the movementof said main valve.

13. The combination with a main valve, and operating means therefor, of a to and. from pipe connected with said valve, means in said pipe responsive to flow, and means connected thereto for limiting the opening and closing movements of said main valve.

14;. The combination with a main valve, and a pilot valve therefor, of a valve b tween said pilot valve and the main valve for stopping said main valve independently of the pilot valve, and automatic meansfor actuating said valve,

15. The combination with a main valve, and a pilot valve therefor, of a valve controlling the main valve for stopping said main valve when the pilot valve is open, and means eflective when the main valve is open for automatically controlling said valve.

16. The combination with a main valve, and a pilot valve therefor, of an auxiliary normally open valve for controlling the movement of said main valve, and means for closing said auxiliary valve to stop the main valve without closing the pilot valve.

17. The combination wlth a main fluid pressure operated valve, and manual controlling means, of pressure and exhaust auxiliary normally open valves for stopping movement of said main valve in opposite directions, and means actuated by flow to or from said main valve for closing one of said auxiliary valves to stop the main valve independently of the manual controlling means.

18. The combination with a pressure operated, manually controlled main valve, of normally open valves respectively located in the actuated fluid supply and exhaust passages for said main valve, and flow actuated. means for closing one or the other of said valves to stop said main valve independently of the manual controlling means.

19. The combination with a pressure operated, manually controlled main valve, of normally open valves respectively located in the actuating fluid supply and exhaust passages for said main valve, and a single flow actuated device for closing one or the other of said valves to stop said main valve independently of the manual controlling means.

20. The combination with a pipe, of a device movable by the flow in said pipe, a main valve, :5. pilot valve for controlling said main valve, and means controlled by said flow actuated device for limitin at a predetermined position, opening 0% said main valve.

21.1 The combination with a main valve, of an unbalanced flow controlled valve for governing the travel of said mainvalve.v

2:2,The combination witha main valve,

of an unbalanced,normally open valve, flow controlled means for closing said valve to limit the travel 01' the main valve, and means for regulating said valve to vary its responsiveness to flow.

23. The combination with an unbalanced valve, of means for holding said valve open, means for; adwstmg sa1d holding means,

flow controlled means for closing said valve against said holding 'means, and a main valve having its travel limited by the closing of said valve; 7 V

v2lp'lhe combination with a pipe, of a vane movable therein with the flow, a plurality of independently movable valves connected tosaid vane, means whereby move- Gopies of this-patent may be ,obtained for naeaeas neeted to said vane, means whereby movement of sa1d vane 1n opposlte dlrections in dependently actuates one of said valves,

means for restoring said aotuated" valve to initial position, and means for adjusting said restoring means. i

In testimony whereof I ailix my signature, in presence of two witnesses.

EDVVARD LEE DUNN.

l Vitnesses: v

7 B. E. GARRETT,

E. KEMP.

five cents each, by addressing the Commissionervof Patents, Washington, D. 0. a 

